1.People in the West like driving cars.
2.Cars run on petrol.
3.Petrol comes from oil.
4.Lots of oil comes from Saudi Arabia.
5.Lots of Westerners are in Saudi Arabia to help extract the oil.
6.For Muslims, the first and second most sacred sites are in Saudi Arabia.
7.For some Muslims the Western presence in Saudi Arabia is a threat to the Umma (worldwide Muslim community).
8.A Muslim should defend the Umma if it is threatened from outside (Qur'an).
9.Some from 7. take this extremely seriously.